Related Clues:
- What a Bowflex may strengthen
- Seedy part of an apple
- Six-pack group
- 'Six-pack'
- Core muscles, briefly
- Muscles targeted by crunches
- What sit-ups build
- Corporeal stabilizers
- Apple's middle
- Crunches work them
- Muscles targeted in core workouts
- Muscles used in a Russian twist, for short
- Midsection muscles
- Target of strengthening exercises
- Part of the body that crunches work